gistfile1.txt

/some/configuration/file:
  file:
    - managed
    - source: ...
    - template: jinja
    

# Pillar stuff:
db_master:
  - master.db.name

db_slaves:
  - slave1.db.name
  - slave2.db.name
  
# In configuration file
<configuration content>
{% if opts['id'] in pillar['db_master'] %}
master configuration goes here.
{% endif %}
{% if opts['id'] in pillar['db_slaves'] %}
slave configuration goes here
{% endif %}